Abstract
In the following pages are presented the results of an attempt at the determination of the chemical characters of magmas which may control the formation of leucite in igneous rocks. Connected with this is an examination of the validity of the orders of affinity of the bases for silica and for alumina, which have been assumed as fundamental in the calculation of the norm in the quantitative classification. The paper is an extension of some previous studies, to be referred to subsequently, undertaken under the auspices of the Carnegie Institution. It may be pointed out here that the methods employed in the case of leucite are capable of application to other minerals.
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